A note can be subsumed into its parent domain by manually removing all sponsors of a note's header thot.
When a note is subsumed, all Whispers, Inklings, Piles, Files, and Note References of the subsumed note are updated to the note it was subsumed into.
Once a note is subsumed and the current editor is exited, the note subsumption becomes permanent and is unable to be undone.